BITUMEN
DUCTILITY TEST OF BITUMEN
Ductility is the property of bitumen that permits it to undergo great deformation or elongation.The ductility test gives a measure of adhesive property of bitumen and its ability to stretch. In flexible pavement design, it is necessary that binder should form a thin ductile film around aggregates so that physical interlocking of the aggregates is improved. Binder material having insufficient ductility gets cracked when subjected to repeated traffic loads and it provides previous pavement surface. Ductility of a
bituminous material is measured by the distance in centimeters to which
it will elongate before breaking when two ends of standard briquette
specimen of material are pulled apart at a specified speed and specified
temperature.
Bitumen is a mixture of Organic Liquids that are highly Viscous, Black, Sticky, Entirely Soluble in Carbon Disulfide, and composed primarily of highly condensed Polycyclic Aromatic Hydrocarbons.
DUCTILITY TEST OF BITUMEN
VIDEO LINK IS GIVEN BELOW TO THE FIGURE
Ductility Test of Bitumen
SOFTENING POINT TEST
This test is done to determine the softening point of asphaltic bitumen
and fluxed native asphalt, road tar, coal tar pitch and blown type
bitumen as per IS: 1205 – 1978.Significance and Use
Bitumens
are visco-elastic materials without sharply defined melting points; they
gradually become softer and less viscous as the temperature rises. For
this reason, softening points must be determined by an arbitrary and
closely defined method if results are to be reproducible. The
softening point is useful in the classification of bitumens, as one
element in establishing the uniformity of shipments or sources of
supply, and is indicative of the tendency of the material to flow at
elevated temperatures encountered in service.
This
test method covers the determination of the softening point of bitumen
in the range from 30 to 157°C [86 to 315°F] using the ring-and-ball
apparatus immersed in distilled water [30 to 80°C] or USP glycerin
(above 80 to 157°C). The
values stated in either SI units or inch-pound units are to be regarded
separately as standard. The values stated in each system may not be
exact equivalents; therefore, each system shall be used independently of
the other. Combining values from the two systems may result in
non-conformance with the standard. This
standard does not purport to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user of
this standard to establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to use.
VIDEO LINK IS GIVEN BELOW TO THE FIGURE
Softening Point of Bitumen
PENETRATION TEST OF BITUMEN
Consistency of a bituminous material expressed as the distance in tenths
of a millimeter that a standard needle vertically penetrates a sample
of the material under known conditions of loading, time, and
temperature.Significance and Use
The penetration test is used as a measure of consistency. Higher values of penetration indicate softer consistency.
This test method covers determination of the penetration of semi-solid and solid bituminous materials.The needles, containers and other conditions described in this test method provide for the determinations of penetrations up to 500. The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non conformance with the standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
VIDEO LINK IS GIVEN BELOW TO THE FIGURE
Penetration Value of Bitumen
No comments:
Post a Comment